AI Prompt Token Estimator
Analyze your system instructions, context payloads, and prompt blocks to calculate token consumption, memory overhead, and estimated API expenses.
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Prompt Tokens
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Words
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Characters
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Est. API Cost
Prompt Engineering Best Practices
Keeping track of prompt overhead helps prevent context window truncation and reduces unnecessary API expenses. Use this utility to optimize long instructions, trim redundant context blocks, and ensure your prompt structures fit comfortably within target model specifications.
Frequently Asked Questions (FAQ)
Counts are derived from industry-standard subword tokenization ratios (~4 characters per token for English text and code blocks), delivering fast, reliable approximations for prompt planning.
No. All text processing occurs entirely client-side inside your browser session to maintain complete data privacy.